Unaudited Condensed Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 21,306	$ 30,613
Other comprehensive (loss) income:
Foreign currency translation (loss) gain	(1,724)	2,761
Total other comprehensive (loss) income	(1,724)	2,761
Comprehensive income	19,582	33,374
Less: comprehensive income attributable to non-controlling interest	3,361	2,857
Comprehensive income attributable to Iconix Brand Group, Inc.	$ 16,221	$ 30,517